Yes the narrator did an excellent job and I look forward to hearing his next series, should it be something that interests me. He was mainly restricted (understandably) at looking at this from a political perspective, and with the default BBC position of a secular standpoint, he wasn't able to comment on some of the other aspects touched upon as his investigation unfolded.
In the main, the people he met who were making spiritual comments were OTT and would discredit those who would possess a more balanced viewpoint and welcome a reasonable conversation with you, me or any media reporter.
Having said that, he was doing this mainly for a british audience, who would mostly NOT care to hear about some major shifts in spiritual influences in the USA from the 90's to the present day - as a spiritual vacuum for the under 40's has been filled with many practices that can be collectively summed up as the occult*
* (in just
one area of the Occult - "The numbers of Americans who identify with Wicca or paganism has risen from 134,000 in 2001 to nearly 2 million today") >>
LINK
Of course when voting happens in the UK, we as a nation care little for the candidates spiritual position; as long as he/ she doesn't slaughter goats on their local common at midnight or condemn people associated with the ever growing list of letters starting with LGB.
So yes, there is a coming storm and Gabriel Gatehouse has already witnessed aspects of it with a number of red herrings (as there always is) thrown into the mix - I really hope he and others keep an eye on the significant narritive - and keep that magnifying glass close at hand.